FACOM 128

{{Short description|Japanese relay-based electromechanical computer}}

The FACOM 128 was a relay-based electromechanical computer built by Fujitsu. Two models were made, namely the FACOM 128A, built in 1956, and the FACOM 128B, built in 1959.{{Cite web|url=http://museum.ipsj.or.jp/en/computer/dawn/0012.html|title=FACOM 128A and 128B Relay Computers|website=museum.ipsj.or.jp|access-date=2019-12-01}} {{As of|2019}}, a fully working FACOM 128B is still in working order, maintained by Fujitsu staff at a facility in Numazu in Shizuoka Prefecture.{{Cite web|url=https://www.extremetech.com/computing/296022-fujitsu-has-an-employee-dedicated-to-keeping-a-1959-computer-up-and-running|title=Fujitsu Has an Employee Who Keeps a 1959 Computer Running|website=www.extremetech.com|access-date=2019-12-01|first=Joel|last=Hruska|date=August 1, 2019}}{{Cite web|url=http://www.asahi.com/ajw/articles/AJ201907280007.html|title=Technician keeps computer made in 1959 still humming along|website=The Asahi Shimbun|language=en|access-date=2019-12-01|archive-date=2020-01-29|archive-url=https://web.archive.org/web/20200129214336/http://www.asahi.com/ajw/articles/AJ201907280007.html|url-status=dead}}

The FACOM 128B processes numbers using a bi-quinary coded decimal representation.{{Cite web|url=https://hackaday.com/2019/08/03/maybe-the-oldest-computer-probably-the-oddest/|title=Maybe The Oldest Computer, Probably The Oddest|last=Williams|first=Al|date=2019-08-03| website=Hackaday|language=en-US|access-date=2019-12-01}}